diff --git a/free-programming-books.md b/free-programming-books.md
index df5acd9e..395333be 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -434,6 +434,7 @@
 * [Practical File System Design:The Be File System](http://www.nobius.org/~dbg/practical-file-system-design.pdf) (PDF) - Dominic Giampaolo
 * [The Art of Unix Programming](http://catb.org/esr/writings/taoup/html/) - Eric S. Raymond
 * [The Little Book of Semaphores](http://greenteapress.com/semaphores/) - Allen B. Downey
+* [UNIX Application and System Programming, lecture notes](http://www.compsci.hunter.cuny.edu/~sweiss/course_materials/unix_lecture_notes.php) (PDFs) - Prof. Stewart Weiss
 * [Xv6, a simple Unix-like teaching operating system](http://pdos.csail.mit.edu/6.828/2012/xv6.html) (PDF)